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<p>[QUOTE=&quot;Numbers, post: 2643151, member: 11668&quot;]Sounds good so far.</p><p><br /></p><p><br /></p><p><br /></p><p>Here I think you&#039;ve gotten in trouble, because (a) two of the 16 binaries are solids, and (b) it doesn&#039;t matter which digit you call &quot;first&quot; and which digit you call &quot;second&quot;.&nbsp; So instead of 16 you want 14, and instead of 10 x 9 = 90 you want 90 / 2 = 45.&nbsp; So there are only 14 x 45 = 630 binary radars (exclusive of the solids).</p><p><br /></p><p>Thus the number of trinary radars is</p><p><br /></p><p>10,000 - 5040 - 630 - 10 = 4320.</p><p><br /></p><p><br /></p><p><br /></p><p>Right, as long as we&#039;re counting solids as radars and repeaters and binaries.&nbsp; Otherwise it gets messy.[/QUOTE]</p><p><br /></p>

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